Towel rack



FIG. 1 is a perspective view of a towel rack showing my new design, the broken-line disclosure being for illustrative purposes only and forming no part of the claimed design;

FIG. 2 is a front elevational view thereof;

FIG. 3 is a top plan view thereof; and,

FIG. 4 is a left side view thereof, the opposite side being a mirror image of the side shown. 

The ornamental design for a towel rack, as shown and described. 